By using future.recover() we can easily have informative stack traces.

FutureStackTraceTest.scala

package scala.concurrent

import scala.concurrent.duration._
import org.scalatest.FeatureSpec

class FutureStackTraceTest extends FeatureSpec {

  ignore("stack trace of Future") {

    implicit val executionContext = scala.concurrent.ExecutionContext.Implicits.global

    val f = Future {
      Unit
    }.map { _ =>
      Unit
    }.map { _ =>
      throw new Exception("Test exception.")
    }.map { _ =>
      Unit
    }.map { _ =>
      Unit
    }

    Await.result(f, 5 seconds)

    /**
     * Produces:
     *
     * [info] FutureStackTraceTest:
     * [info] Scenario: stack trace of Future *** FAILED *** (9 milliseconds)
     * [info]   java.lang.Exception: Test exception.
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$1$$anonfun$4.apply(FutureStackTraceTest.scala:17)
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$1$$anonfun$4.apply(FutureStackTraceTest.scala:16)
     * [info]   at scala.util.Success$$anonfun$map$1.apply(Try.scala:206)
     * [info]   at scala.util.Try$.apply(Try.scala:161)
     * [info]   at scala.util.Success.map(Try.scala:206)
     * [info]   at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
     * [info]   at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
     * [info]   at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
     * [info]   at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)
     * [info]   at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
     * [info]   at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
     */
  }

  scenario("stack trace of Future with recover") {

    implicit val executionContext = scala.concurrent.ExecutionContext.Implicits.global

    val f = Future {
      Unit
    }.map { _ =>
      Unit
    }.map { _ =>
      throw new Exception("Problem in database.")
    }.recover {
      case e: Exception => {
        throw new Exception("Problem while storing the data.", e)
      }
    }.map { _ =>
      Unit
    }.map { _ =>
      Unit
    }.recover {
      case e: Exception => {
        throw new Exception("General problem.", e)
      }
    }

    Await.result(f, 5 seconds)

    /**
     * Produces:
     *
     * [info] Scenario: stack trace of Future with recover *** FAILED *** (10 milliseconds)
     * [info]   java.lang.Exception: General problem.
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$2$$anonfun$4.applyOrElse(FutureStackTraceTest.scala:68)
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$2$$anonfun$4.applyOrElse(FutureStackTraceTest.scala:66)
     * [info]   at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33)
     * [info]   at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:185)
     * [info]   at scala.util.Try$.apply(Try.scala:161)
     * [info]   at scala.util.Failure.recover(Try.scala:185)
     * [info]   at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324)
     * [info]   at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324)
     * [info]   at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
     * [info]   at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)
     * [info]   at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
     * [info]   at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
     * [info]   Cause: java.lang.Exception: Problem while storing the data.
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$2$$anonfun$3.applyOrElse(FutureStackTraceTest.scala:60)
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$2$$anonfun$3.applyOrElse(FutureStackTraceTest.scala:58)
     * [info]   at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33)
     * [info]   at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:185)
     * [info]   at scala.util.Try$.apply(Try.scala:161)
     * [info]   at scala.util.Failure.recover(Try.scala:185)
     * [info]   at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324)
     * [info]   at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324)
     * [info]   at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
     * [info]   at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)
     * [info]   at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
     * [info]   at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
     * [info]   Cause: java.lang.Exception: Problem in database.
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$2$$anonfun$12.apply(FutureStackTraceTest.scala:57)
     * [info]   at scala.concurrent.FutureStackTraceTest$$anonfun$2$$anonfun$12.apply(FutureStackTraceTest.scala:56)
     * [info]   at scala.util.Success$$anonfun$map$1.apply(Try.scala:206)
     * [info]   at scala.util.Try$.apply(Try.scala:161)
     * [info]   at scala.util.Success.map(Try.scala:206)
     * [info]   at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
     * [info]   at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)
     * [info]   at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
     * [info]   at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)
     * [info]   at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
     * [info]   at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
     * [info]   at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
     */
  }
}